I think your best bet is to change out the fitting to run one propane bottles that you can buy today. I'm sure someone has probably done it on that vintage stove site.

Agreed, I would look into swapping out the "Gerry/Roberts" needle for a Lindal valve fitting and stick with butane or the new iso mixes. By design that stove is liquid inject and using gas from Brunton, Primus or Snowpeak it would kick any propane stove a$$ in cold weather or at altitude.